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Full text of "Metallurgy Of Cast Iron"

TABLE   71.—CHEMICAL  ANALYSIS  OF  TABLE   70.
Analysis L,etter.	A	B	C	D
Total Carbon .......... ...................................... .	4- =5	4-03	4-15	4.10
Graphite Carbon ..........................................	2.07	1.76	1.94	3-92
Combined Carbon ....................................	2.18	2.27	2.21	.18
Silicon      .....         ...................................... .	•85	.92	•99	2.70
Sulphur .................................. .......................	.21	.19	.17	•03
Manganese. ...................................................	.18	•17	.26	•34
Phosphorus ......................... ..........................	.192	.129	.655	.085
Iron by difference ................. ............................	94-32	94 S6	93.77	92.74
The importance of this work will be better understood when it is stated that at the present time (1897) some are laying claim to tests proving that soft grades of all irons will melt down faster than hard irons. The contrary results have chiefly been my experience, and appear to be the general expression on this question. Still, I hold, as stated in the early part of this paper, that results are often affected by combination of the metalloids as well as by the physical character of the iron, and I believe my second paper will bear me out in this assertion. I desire here to thank Dr. Richard Moldenke and the McConway & Torley Co. of Pitts-burg for the assistance rendered me in this work by furnishing metals and complete analyses of the irons shown.
Referring to the preceding tables, attention is first called to the analyses. The column under A, Table 71, is that of hard iron in heats Nos. i and 2. B is that of a white iron used for heats Nos. 3 and 4, C is that of a mottled iron used for heats Nos. 5, 6, 7, and 8, while D is the analysis of a soft iron used as a comparative constant to the hard irons throughout the eight heats. It may be stated that drillings for45 s.	i m.	10 s.	45 s.	i m.	15 s.	nil 3os	nn 458